Anti-lock-picking device.



W. H. DRAPER. ANTILGCKPICKING DEVICE.

APPLICATION man APR. 3. 191s.

1,208,930. Patented De .19,1916.

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| f PETE Rs l l l UNITED srarns rarn-Nrormon.- i

WILLIAMl H. Daarna, or Kansas CITY,y ,MISSOURI j Y ANTI-LocK-rrcxnve nnvvicn.

To all whom t may concern.'

Be it known that I, WILLIAM I-I. DRAPER, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvementsin Anti-Lock- Picking Devices, of which the following is a specification.- 1 -V My invention relates to antilock picking devices, and my object is to provide a simple and inexpensive device of this character which may be secured in a door lock to prevent the insertion of a key for the purpose of throwing the bolt of said lock.

The device is small so that it can be readily carried in the pocket by travelers and others desiring to secure doors' against the entrance of unauthorized persons.

In order that the invention may be readily understood, reference will now be made to the accompanying drawing, in which:

Figure 1 is a perspective view of the device. Fig. 2 is a broken section of a lock with the device applied thereto. Fig. 3 is a sectional plan view of the parts disclosed by Fig. 2. Fig. 4 is a detail perspective of the retaining member of the device. Fig. 5 is a detail perspective of the lock-engaging member of the device. Fig. 6 is a cross section of a barrel employed in carrying out the invention.

In carrying out the invention,.I employ a lock-engaging member 1, provided at one end with a knob 2 and at its opposite cylindrical end 3 with a bit 4 for engagement with the inner wall of a lock B, applied in the present instance to the exterior of a door C. Intermediate the knob 2 and the cylindrical end 3 are marginal teeth 5, preferably in the form of ratchet teeth to allow the member 1 to be adjusted longitudinally in one directipn over a detent 11, as will hereinafter appear.

6 designates a retaining member which coacts with the lock-engaging member 1. Said retaining member 6 is provided at its upper portion with a rectangular opening 7 extendingl therethrough to receive the lock-engaging member 1, which is rectangular in cross section throughout the greater portion of its length toprevent it from rotating within the openlng 7. @ne end of the retaining member 6 has a projection 8 beneath the opening 7, to enter the key-hole A of the lock B, as disclosed by Fig. 2, and

Specification of Letters Patent.

j .raten-tea nee.4 1e, i916?.

. Application filed April 3, 1916. Serial No. 86,659.1

prevent'l said-retaining member` from rotat ing when in operative position. The oppos 1t e end of theY retainingV member 6 is PIOVlded ywith ai barrel'9 :having aL keyhole 10 to receive a suitable key, preferably, of the flat pin lock type. By turning the Vkey in one direction, the barrel 9 is rotated and lifts the detent l1 into engagement z with ,oneof the ratchet teeth 5. When said barrel .9 is rotated in the opposite direction a peripheral recess 12 therein is brought beneath the detent 11, which is immediately forced downward into said recess and out of engagement with a tooth 5 by a coil spring 13. A tumbler 14 controlled by the key and a coil spring 15, locks the barrel 9 from rotation when the detent 11 is raised into engagement with a tooth 5. threaded into the member 6 and extending into a peripheral groove 18 in the barrel 9, holds the samel from longitudinal displacement.

The operation is substantially as follows: Preparatory to inserting the device in a lock, the member 1 isy pushed far enough through the retaining member 6 to allow the bit 4 to enter the lock, whereupon the entire device is turned a quarter. of a revolution to bring the bit 4 at right angles to the keyhole A. The device is then drawn back a short distance to bring said bit firmly against the inner wall of the lock as disclosed by Fig. 3. The retaining member 6 is then advanced along the engaging member 1 to insert the projection 8 into the keyhole A and bring the adjacent end of said member 6 against the outer wall of the lock. With the parts thus disposed, the projection 8 prevents thel device from being turned back a quarter of a revolution to permit the bit 4 to be withdrawn from the keyhole. The member 6 is then locked from backward movement on the member 1 by inserting the proper key in the barrel 9 and rotating the same until the detent 11 is raised into engagement with one of the teeth 5. The key is then removed from the barrel whereupon the latter is immediately locked by the tumbler 14. rIhe above operation is reversed when the device is to be removed from the lock.

While I have shown the device applied to a rim lock, it is to be understood that it will operate equally as well on a mortise lock, and the lock-engaging member 1 is of A screw 17 15 ters Patent, is:

such length as to yenable the device to be inserted from the opposite side of the .doolI on which a rim lock islocated. Y

From the foregoing description, it is apparent that I have produced aysilmple device embodying all of the features ffadyantage above enumerated, and While I have shown and described the preferred form of my invention, I reserve the right Lto make such changes in the construction, combination, and arrangement of parts as properly fall Within the spirit and scope of the claim.

Having thus described my invention, What I claim and desire to secureby Let A device of he character described? conssting :of ,a member having a bit adjacent one end and marginal ratchet teeth, a retaining member adjnstably mounted upon the 'li'stuinember and'provided at one end with .a projection, a detent carried by said retaining member to engage the teeth of the rst member, a key-controlled barrel for actuating said detent, and means for locking .said lbarrelfrom rotation when the detent is in engagement with a tooth.

In testimony whereof I'aix my signature, in the presence of two Witnesses.

f Y WILLIAM DRAPER. Witnesses:

F. G. FISCHER, 'L.`J. FISCHER.

copies of this .patent may be obtained forrnve cents each, by addressing the Commissioner ,of Patents,

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